摘要
氨基酸在土壤氮素循环及作物养分供给中既扮演着库的角色又起着源的作用。本文通过田间试验研究肥料施用及肥料与秸秆配施后土壤氨基酸在玉米不同生长时期的数量变化,探讨了土壤氨基酸的可利用性及其动态特征。研究发现,在玉米需氮高峰期,耕层土壤,尤其是10～20 cm层次的氨基酸氮含量降低以部分满足植物的氮素需求;在玉米成熟期,土壤氨基酸含量又有所回升。秸秆配施增加了土壤氨基酸氮的含量,从而提高了土壤持续供氮能力。
Soil amino acids are important for plant nutrition and act as both sink and source of nitrogen. In order to probe into the dynamics of soil amino acids and their availability in agricultural ecosystem, a field experiment was conducted on the two treatments included N fertilizer applications with and without crop stalk return. The contents of amino acids were determined at different growing stages of maize （Zea mays L.）. During the silking and filling stages when the N uptake of the crop was intense, the contents of soil amino acids, especially in l0 - 20 cm depth, declined significantly to partly compensate the N demand. At the stage of harvest, the contents of soil amino acids rebounded although the magnitude in 10 - 20 cm was still lower than original value in N fertilization. The return of crop stalk enhanced the accumulation of soil amino acids and improved the capability of soil for the sustainable N application.
出处
《土壤通报》
CAS
CSCD
北大核心
2012年第1期31-36,共6页
Chinese Journal of Soil Science
基金
国家自然基金面上项目(40871149)
中国科学院沈阳应用生态研究所陆地生态过程重点实验室项目(08ZDS151SS)
辽宁省博士科研启动基金(20091091)资助
关键词
氨基酸
玉米生长
可利用性
动态
秸秆
氮循环
Amino acids
Crop growing stage
Availability
Dynamics
Stalk
Nitrogen turnover
